According to researchers at the University of Surrey who looked at the iodine content of 47 health milks - including soya, coconut, almond rice and oat milk - the levels of iodine were two per cent lower of those in cow's milk, The Times reported.

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Although there was said to be no difference in the nutrients gained from skimmed, semi-skimmed or full fat.

Meanwhile studies carried out by the World Health Organisation (WHO) have shown a 13-point difference in IQ among groups with high iodine levels in their diet, and those with high levels of deficiency.

Worryingly, a 2011 study measured the amount of iodine in urine samples collected from 737 teenage girls from all over the UK.

It found that nearly 70 per cent had levels below 100 micrograms per litre — the acceptable minimum level defined by the WHO.